Before opening a service ticket or diving into complex diagnostics, perform these basic but critical checks. Many "hangs" are caused by simple, overlooked issues.
Using a digital multimeter, check the test points on the FANUC PSU. If the +5V rail reads low (e.g., 4.6V), the memory modules cannot operate. How to Recover and Restore Data
: Ensure that the system configuration is correct. If recent changes have been made to the hardware or software configuration, verify that they are correctly set up and supported.
This usually requires a System Reload .
: A common cause is a faulty main card or SRAM card. If the 7-segment display on the main board shows a specific digit (e.g., "1" or "6"), it may indicate a failure in these components.
The memory holding the operating system is damaged or losing connectivity.
: Check for specific codes. A "0" might indicate a parity alarm in the DRAM, while other codes can point to specific hardware failures.
Is the R30IB controller stuck on "system software starting up"?
: Fluctuations in the 24VDC supply can cause a "race condition" that halts the boot process. Check for stable power and ensure the main transformer doesn't have burned phases or loose connections. 2. Monitor Hardware Status LEDs